Improvement in shutter-workers



2 Sheets-Sheet 1.

S. W. MERRY. SHUTTER-WORKER. No. 183,191. Patented Oct.10.1876.

2 Shank-Sheet Z.

(UNITED STATES PATENT OFFICE.

SAMUEL W. MERRY, OF QUINCY, ILLINOIS.

lM PROVEMENT IN SHUTTER-WORKERS.

Specification forming part of Letters Patent No. 183,191, dated October10, 1876; application filed November 27, 1875.

To all whom it may concern:

Be it known that I, SAMUEL WADE MERRY, of Quincy, in the county of Adamsand State of Illinois, have invented certain new and useful Improvementsin Shutter-Workers; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it pertains to make and use it,reference being had to the accompanying drawings, which form part ofthis specification, in which- Figure 1 is a perspective view of myinvention. Figs. 2 and 3 are detail views.

The invention relates to an improved apparatus for operating hingedshutters; and consists in the devices hereinafter more fully described,being, essentially, of certain disks, one provided with vertical pointedteeth secured to the shutter, the other operated by a shaft extendingthrough the wall adjacent the casing, and provided with tapered prongs,the disks being arranged so that when rotated the prongs and teethengage, thus operating the shutter.

The object of the invention is to provide a means of controlling themovement of the shutter from within, and to produce a device that, whileoperating with less friction, is not so apt to become clogged as devicesheretofore employed.

Figure 1 is a front elevation of a device embodying the elements of theinvention. Fig. 2 is a detached view of the part of same attached to thewall. Fig. 3 is a transverse section through the shaft 0 at a pointadjacent the handle a.

In the accompanying drawings, A represents a section of the wall orcasing to which the shutter B is hinged. Through the wall A extends theshaft G, terminating in the handle 0, at the base of which is suppliedthe feather g, which, when the shutter is opened or closed, shall comedirectly opposite the slot g out in the collar 9 of the disk E; and asthe shaft 0 is movable horizontally in the wall, the feather may beforced into or withdrawn from the slot g thereby respectively lockingthe shutter open or releasing it for movement.

To the end of the shaft 0 that projects beyond the wall is rigidlysecured the disk 0, adjacent the periphery of which are secured at theirbases the prongs 01. These prongs are tapered from base to point, arecircular in section, and curved or inclined in the direction of themovement of the disk, their under being shorter than their outer curves.They are placed equidistantly upon the disk, and so separated as topermit snow and other clogging matter to pass readily between them.

To the shutter B is secured, by the wings 6 the plate D, which projectsfrom the surface of the shutter at right angles, and is furnished on itslower surface with the dependent tapering teeth 0 which are circular intransverse section, placed equidistantly adjacent the edge of the plateD, and depend sufficiently to engage the prongs d aforesaidthat is tosay, so that the one of the teeth 0 is always in the space between theadjacent two prongs d.

Now, it is obvious that, the shaft 0 being rotated in one direction-forexample, to open the shutter--the inner curve of the prong d comes incontact with the tooth c and that the surface of the prong whichimpinges the tooth will be a surface moving down an inclined plane-thatis, down the tapered surface of the tooth--which reduces the friction asthe operation advances; and one prong after another engaging the teeth,and only one prong and one tooth ever being engaged simultaneously, itis plain that the shutter will be easily opened, and, when opened, maybe looked, as aforesaid.

A contrary movement of the handle closes the shutter by bringing therear of the prongs in contact with the teeth, and exhibiting the sameprinciple of operating-to wit, two cooperating inclined planes, themotor of one of which is inclined in the direction in which the other isto be moved.

It is plain that the devices heretofore in vented, and in which toothedor beveled wheels have been employed, do not exhibit an application ofthe principle of operation above In testimony thatI claim the foregoingI stated, being, moreover, very liable to become have hereunto set myhand this 13th day of clogged by foreign matter. November, 1875.

What I claim as my invention, and desire to secure by Letters Patent,is- SAMUEL WADE MERRY.

The disk 0, secured to a movable shaft, and provided with the curvedtapered prongs d, Witnesses: in combination with the bracket D, providedGEO. WOLGOTT, with the dependent teeth a, substantially as J. PHIL.BERT. specified.

